A cement solidification stirring device and method

Abstract

The present invention relates to a nuclear power waste liquid treatment device, specifically including a cement solidification stirring device and method. At present, fixed stainless steel spiral stirring paddles are mainly used for stirring inside the barrel. This stirring paddle has a complex structure, high production cost, great difficulty in maintenance and repair, and high treatment cost. The hanger is slidably connected to the guide rail, and the guide rail is placed on the steel platform as a whole. The barrel cover is installed below the center of the large flange of the hanger; the barrel cover is installed on the curing barrel, and an air exhaust port is opened on the barrel cover. The guiding and positioning block is installed on the outer edge of the barrel cover; the hanger suspends the motor device; the centering shaft seat is fixedly welded to the bottom of the curing barrel. The spiral stirring paddle is cylindrical as a whole, and the bottom of the cylinder is fixedly connected to the centering shaft seat. The paddle shaft positioning bushing is fixedly installed at the upper end of the spiral stirring paddle. The cement solidification stirring method includes preparatory work, automatic docking, starting stirring, and cement solidification. The present invention is a cement solidification stirring device that avoids secondary cleaning of the paddle blades and keeps the curing area and the outer wall of the waste barrel clean.

Description

Technical Field

[0001] The present invention relates to a nuclear power waste liquid treatment device, and specifically includes a cement solidification stirring device and method. Background Art

[0002] In China, for the cement solidification treatment of radioactive waste liquid, the process of stirring and solidifying in a barrel is generally adopted. The stirring equipment all uses a stainless steel planetary double - helix stirring paddle, which is fixed at the lower part of the stirring equipment. During stirring, the stirring paddle is put into the solidification barrel filled with cement through a lifting device, waste liquid is injected into the barrel and stirred until uniform, then the stirring paddle is lifted, and the solidification barrel is sealed. During this process, due to the viscosity of the cement slurry, after stirring is completed, cement slurry adheres to the paddle blades and the paddle shaft to form a cement coating. Therefore, to ensure the continuity and reliability of the cement solidification process and minimize the cement residue on the stirring paddle as much as possible, the stirring paddle needs to be cleaned after each stirring. However, during the lifting and cleaning process of the stirring paddle, the cement slurry is likely to drip onto the process production line and the solidification barrel, causing contamination. Currently, the production process of stirring and solidifying in a barrel is cumbersome and the production cost is high. Since the stirring paddle and the stirring equipment are integrated, the structure of the stirring device is complex, and in addition, the stirring paddle is prone to residual cement, resulting in a high maintenance frequency. If the stirring paddle is separated from the stirring equipment, after stirring is completed, the stirring paddle remains in the solidification barrel and solidifies together with the cement slurry, and the above - mentioned problems can be solved. Therefore, a cement solidification stirring device with an automatic docking and separation function between the stirring paddle and the stirring equipment is designed. After stirring is completed, the stirring equipment and the stirring paddle are automatically separated, and the stirring paddle remains in the solidification barrel, ultimately achieving the purpose of discarding the paddle and solidifying the cement. Summary of the Invention

[0003] Aiming at the problems existing in the above - mentioned prior art, the purpose of the present invention is to provide a paddle - discarding stirring device for the cement solidification of radioactive waste liquid, which can stir the cement slurry evenly, solidify the stirring paddle together with the cement, and avoid cleaning, solving the problems that the repeated use of the stirring paddle is likely to cause contamination of the solidification area and the outer wall of the waste barrel and the increase of secondary radioactive waste liquid due to rinsing.

[0004] Another purpose of the present invention is to provide a usage method for a cement solidification stirring device for radioactive waste liquid, and the usage method can stir the cement slurry evenly and avoid the jamming of the stirring paddle.

[0005] To achieve the above - mentioned purposes, the technical solution adopted by the present invention is: to provide a stirring device and method for the cement solidification of radioactive waste liquid.

[0006] The beneficial effects of the present invention compared with the prior art are:

[0007] A cement solidification stirring device, comprising: a hanging bracket, a guide rail, a motor device and a reducer, a stirring seal cover, an automatic docking mechanism, a paddle-type cement solidification barrel, and a jacking device. The hanging bracket is slidably connected to the guide rail, and the guide rail is placed on a steel platform as a whole. The stirring seal cover is installed below the center of the large flange of the hanging bracket; the stirring seal cover is installed on the solidification barrel, and an air exhaust port and a waste liquid feeding port are opened on the stirring seal cover, and a guiding and positioning block is installed on the outer edge of the stirring seal cover; the hanging bracket suspends the motor device, and the motor device and the reducer pass through the stirring seal cover and are fixedly connected to the automatic docking mechanism; a centering shaft seat is fixedly welded to the bottom of the solidification barrel, the spiral stirring paddle is cylindrical as a whole, the bottom of the cylinder is fixedly connected to the centering shaft seat, and a paddle shaft positioning sleeve is fixedly installed at the upper end of the spiral stirring paddle; the solidification barrel is placed on the jacking device as a whole.

[0008] The hanging bracket is composed of two large and small flanges and three connecting rods. The small flange is on the top, the large flange is on the bottom, and the large and small flanges are concentric in the vertical direction. The three connecting rods are respectively connected at three equal parts of the circumferences of the large and small flanges.

[0009] The guide rail is composed of two large and small channel steels that are mutually inclusive and matched. The small channel steel connecting the hanging bracket can only move up and down in the groove of the large channel steel.

[0010] There are a total of four guiding and positioning blocks, and each positioning block is spaced 90 degrees apart.

[0011] The stirring paddle includes three pairs of paddles and two pairs of auxiliary paddle blades; the three pairs of paddles are divided into three layers, namely the upper, middle, and lower three pairs of paddle blades, which are fixedly connected to the central stirring paddle shaft; the two paddle surfaces of the upper paddle blade are rectangular and centrosymmetric, and form an angle of 165 degrees with the horizontal plane; the two paddle surfaces of the middle paddle blade are rectangular and centrosymmetric, and form an angle of 30 degrees with the horizontal plane; the two paddle surfaces of the lower paddle blade are rectangular and centrosymmetric, and form an angle of 30 degrees with the horizontal plane; the upper paddle blade and the lower paddle blade are in parallel planes, and the middle paddle blade is perpendicular to this plane; the middle paddle blade is located at a position slightly below the center of the barrel body, and a scraper is vertically fixedly connected to the outer end of each paddle surface; the middle auxiliary paddle blade is above the middle paddle blade, 20 mm away from the middle paddle blade, and perpendicular to the middle paddle blade; the lower auxiliary paddle blade is above the lower paddle blade, 20 mm away from the lower paddle blade, and perpendicular to the lower paddle blade; the top of the stirring paddle is a quick connection pin.

[0012] The paddle shaft positioning sleeve includes three connecting arms. The three connecting arms are evenly distributed at 120 degrees. One end is fixedly connected to the central flange of the paddle shaft positioning sleeve, and the other end is fixedly connected to the inner wall of the barrel.

[0013] The centering shaft seat includes a positioning pin, a sliding gasket, and a connecting shaft. The connecting shaft is fixedly connected to the center of the bottom of the solidification barrel. The diameter of the positioning pin is 1 mm smaller than the inner diameter of the stirring shaft and is fixedly connected to the stirring shaft. The sliding gasket is fixedly connected to the bottom of the positioning pin.

[0014] First step, preparation work: Drill holes at the center and outer edge of the curing barrel lid. Install a paddle shaft positioning bushing in the upper-middle part of the inner surface of the curing barrel. Limit and install the mixing paddle at the center of the curing barrel through the paddle shaft positioning sleeve and centering shaft seat; Add the measured cement into the curing barrel with the mixing paddle installed; Transport the curing barrel filled with cement to the mixing station, and use the jacking device to lift the curing barrel to the mixing station.

[0015] Second step, automatic docking: At the mixing station, use the lifting motor to drive the hanging bracket along the guide rail and use the guiding positioning block to ensure it descends to the working position, completing the quick docking of the arc groove of the automatic docking mechanism and the connecting pin; The measured liquid material is added into the curing barrel from the feeding port at a certain flow rate.

[0016] Third step, start mixing: Start the mixing motor, drive the mixing paddle to mix the cement and liquid material in the barrel until uniform; Make the mixing paddle rotate at a low speed of 10 - 20 revolutions per minute, and dock the quick connector of the automatic docking mechanism with the quick connecting pin. Close and seal the mixing seal cover with the curing barrel; Keep the mixing paddle rotating at a medium speed of 50 - 70 revolutions per minute, and add the measured waste liquid into the curing barrel from the waste liquid feeding port at a certain flow rate until completion; Keep the mixing paddle rotating at a medium speed of 50 - 70 revolutions per minute for 15 - 20 minutes, then rotate at a high speed of 80 - 120 revolutions per minute for 5 - 10 minutes, and stop mixing, and the mixing ends.

[0017] Fourth step: Cement curing: After mixing is completed, stop the mixing motor, and the lifting motor drives the hanging bracket to rise along the guide rail. The arc groove of the automatic docking mechanism and the connecting pin are disconnected, and the mixing paddle remains in the barrel to cure with the cement.

[0018] 3. Effect

[0019] The guide rail and guiding positioning block double ensure the precise docking of the quick connector of the docking mechanism; The paddle shaft positioning device includes a positioning sleeve and a centering shaft seat. The positioning sleeve restricts the movement of the mixing shaft in the horizontal plane through the central flange and three arms connected to the curing barrel. The hollow mixing shaft is installed on the centering shaft seat, and the sliding gasket on the centering shaft seat avoids the wear of the mixing paddle, thus cooperating with the positioning sleeve to ensure that the mixing paddle can mix at the center of the curing barrel and ensure the smooth progress of the mixing paddle process; The arc groove of the quick connector of the docking mechanism and the quick connecting pin on the mixing paddle achieve automatic docking and separation during the rotation of the mixing motor. Description of the drawings

[0020] Figure 1 A cement curing and mixing device

[0021] In the figure: 1, hanging bracket; 2, guide rail; 3, blanking opening; 4, barrel cover; 5, guiding and positioning block; 6, steel platform; 7, centering shaft seat; 8, lifting device; 9, curing barrel; 10, stirring paddle; 11, paddle shaft positioning bushing; 12, automatic docking mechanism; 13, air exhaust port. Specific embodiments

[0022] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments:

[0023] As Figure 1 shown, a cement curing and stirring device includes: a hanging bracket 1, a guide rail 2, a motor device and a reducer, a stirring seal cover 4, an automatic docking mechanism 12, a paddle-type cement curing barrel 9, and a lifting device 8. The hanging bracket 1 is slidably connected to the guide rail 2. The guide rail 2 is placed entirely on the steel platform, and the hanging bracket 1 suspends the motor device and the reducer. The stirring seal cover 4 is installed below the center of the large flange of the hanging bracket 1. Passing through the stirring seal cover 4, the upper end of the quick connector of the automatic docking mechanism 12 is fixedly connected to the reducer. The paddle-type cement curing barrel 9 is placed entirely on the lifting device 8. The stirring paddle inside the barrel is fixed to the center of the curing barrel body through the upper paddle shaft positioning bushing 11 and the bottom centering shaft seat 7. The top end of the paddle shaft of the stirring paddle 10 is a quick connecting pin. By lifting and lowering the hanging bracket 1 and the lifting device 8, the combination and separation of the stirring seal cover 4 and the paddle-type cement curing barrel 9 are realized, and the automatic docking and separation of the quick connecting pin on the stirring paddle 10 inside the barrel and the quick connecting head of the automatic docking mechanism 12 are achieved.

[0024] The main working steps are as follows:

[0025] The first step, preparation work: Open holes at the center position and the outer edge of the barrel cover 4 of the curing barrel. Install a paddle shaft positioning collar in the upper middle part of the inner surface of the curing barrel 9. The stirring paddle 10 is installed at the center of the curing barrel 9 through the paddle shaft positioning bushing 11 and the centering shaft seat 7 for positioning. Add the measured cement into the curing barrel 9 installed with the stirring paddle 10. Transport the curing barrel 9 filled with cement to the stirring station, and use the lifting device 8 to lift the curing barrel 9 to the stirring station.

[0026] The second step, automatic docking: At the stirring station, use the lifting motor to drive the hanging bracket 1 along the guide rail 2 and use the guiding and positioning block 5 to ensure that it descends to the working position to complete the quick docking of the arc groove of the automatic docking mechanism 12 and the connecting pin. The measured liquid material is added into the curing barrel 9 from the blanking opening 3 at a certain flow rate.

[0027] Step 3, start stirring: Start the stirring motor to drive the stirring paddle 10 to mix and stir the cement and the liquid material in the barrel until they are evenly mixed; make the stirring paddle rotate at a low speed of 10 - 20 revolutions per minute, connect the quick connector of the automatic docking mechanism with the quick connecting pin, and close and seal the stirring sealing cover with the curing barrel; keep the stirring paddle rotating at a medium speed of 50 - 70 revolutions per minute, add the measured waste liquid into the curing barrel from the waste liquid feeding port at a certain flow rate until it is completed; keep the stirring paddle rotating at a medium speed of 50 - 70 revolutions per minute for 15 - 20 minutes, then rotate at a high speed of 80 - 120 revolutions per minute for 5 - 10 minutes, and stop stirring, and the stirring ends.

[0028] Step 4: Cement solidification: After stirring is completed, stop the stirring motor, and the lifting motor drives the hanger 1 to rise along the guide rail 2. The arc groove of the automatic docking mechanism 12 is disconnected from the connecting pin, and the stirring paddle remains in the barrel and solidifies together with the cement.

[0029] Compared with the prior art, after stirring is completed, the radioactive waste liquid is solidified in the curing barrel by the method of discarding the paddle. The stirring paddle solidifies together with the cement, which is free of cleaning, solves the problems that the repeated use of the stirring paddle is likely to cause contamination of the solidification area and the outer wall of the waste barrel and the increase of secondary radioactive waste liquid due to flushing, reduces the cost of solidifying radioactive waste liquid, and the device is simple to operate and convenient to use.

Claims

1. A cement solidification mixing device, comprising: Hanger (1), guide rail (2), waste liquid discharge port (3), motor device and reducer, stirring seal cover (4), guiding and positioning block (5), steel platform (6), centering shaft seat (7), stirring paddle (10), paddle shaft positioning sleeve (11), automatic docking mechanism (12), paddle-type cement curing barrel (9), lifting device (8) and exhaust port (13); characterized in that: the hanger (1) is slidably connected to the guide rail (2), the guide rail (2) is placed on the steel platform as a whole, and the hanger (1) suspends the motor device and reducer; the stirring seal cover (4) is installed below the center of the large flange of the hanger (1); the stirring seal cover (4) is installed on the curing barrel (9), and the stirring seal cover (4) is provided with an exhaust port (13) and a waste liquid discharge port, and the guiding and positioning block (5) is installed on the outer edge of the stirring seal cover (4); passing through the stirring seal cover (4), the upper end of the quick connector of the automatic docking mechanism (12) is fixedly connected to the reducer; the paddle-type cement curing barrel (9) is placed on the lifting device (8) as a whole, and the stirring paddle in the barrel is fixed at the center of the curing barrel body through the upper paddle shaft positioning sleeve (11) and the bottom centering shaft seat (7), the top end of the paddle shaft of the stirring paddle (10) is a quick connection pin, and the bottom end of the hollow paddle shaft of the stirring paddle (10) is installed on the centering shaft seat (7); by lifting the hanger (1) and the lifting device (8), the combination and separation of the stirring seal cover (4) and the paddle-type cement curing barrel (9) are realized, and the automatic docking and separation of the quick connection pin on the stirring paddle (10) in the barrel and the quick connection head of the automatic docking mechanism (12) are realized; The hanger (1) is composed of two large and small flange plates and three connecting rods. The small flange plate is on the top, the large flange plate is on the bottom, the large and small flange plates are concentric in the vertical direction, and the three connecting rods are respectively connected at the three equal parts of the circumference of the large and small flange plates; The paddle shaft positioning sleeve (11) includes three connecting arms, the three connecting arms are evenly distributed at 120 degrees, one end of the connecting arm is fixedly connected to the central flange of the paddle shaft positioning sleeve (11), and the other end is fixedly connected to the inner wall of the barrel.

2. The cement solidification stirring device according to claim 1, characterized in that: The guide rail (2) is composed of two large and small channel steels that are mutually inclusive and matched, and the small channel steel connecting the hanger can only move up and down in the groove of the large channel steel.

3. A cement solidification stirring device according to claim 1, characterized in that: There are a total of four guiding and positioning blocks (5), and each positioning block (5) is spaced 90 degrees apart.

4. A cement solidification stirring method using the cement solidification stirring device described in claim 1, characterized in that: It includes the following steps: the first step, preparation work; the second step, automatic docking; The third step, start stirring; The fourth step: Cement solidification; among which, the second step, automatic docking includes: at the mixing station, use the lifting motor to drive the hanging bracket (1) to slide along the guide rail (2) and use the guiding positioning block (5) to ensure that it descends to the working position, and complete the quick docking of the arc groove of the automatic docking mechanism (12) and the connecting pin; the measured liquid material is added into the solidification barrel (9) from the material discharging port (3) at a certain flow rate; The third step: Start mixing includes: start the mixing motor, and the mixing motor drives the mixing paddle (10) to mix and stir the cement and the liquid material in the barrel until it is uniform; First, the mixing paddle (10) rotates at a low speed of 10-20 revolutions per minute, the quick connector of the automatic docking mechanism (12) is docked with the quick connecting pin, and the mixing seal cover (4) is closed and sealed with the solidification barrel (9); Then, keep the mixing paddle rotating at a medium speed of 50-70 revolutions per minute, and add the measured waste liquid into the solidification barrel (9) from the material discharging port (3) at a certain flow rate until it is completed; Keep the mixing paddle (10) rotating at a medium speed of 50-70 revolutions per minute for 15-20 minutes, then rotate at a high speed of 80-120 revolutions per minute for 5-10 minutes, stop mixing, and the mixing ends.

5. The cement solidification stirring method according to claim 4, characterized in that: The first step described above, preparation work: Open holes at the center position and the outer edge of the mixing seal cover (4) of the solidification barrel, install a paddle shaft positioning bushing in the upper middle part of the inner surface of the solidification barrel (9), and limit and install the mixing paddle (10) at the center of the solidification barrel (9) through the paddle shaft positioning bushing (11) and the centering shaft seat (7); Add the measured cement into the solidification barrel (9) where the mixing paddle (10) is installed; Transport the solidification barrel (9) filled with cement to the mixing station, and use the jacking device (8) to jack up the solidification barrel (9) to the mixing station.

6. The cement solidification stirring method according to claim 4, wherein: The fourth step described above: Cement solidification: After mixing is completed, stop the mixing motor, the lifting motor drives the hanging bracket (1) to rise along the guide rail (2), the arc groove of the automatic docking mechanism (12) is disconnected from the connecting pin, and the mixing paddle (10) remains in the barrel and solidifies together with the cement.

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